package lab02.test32;

import java.util.HashMap;
import java.util.Map;

public class Test {
    public static void main(String[] args) {
        Map<String,String> map =new HashMap<>();

        map.put("id","1");
        map.put("name","张三");
        map.put("gender","男");
        map.put("age","25");
        map.put("love","爱学Java");
        //遍历一个map
        for (Map.Entry<String ,String >entry:map.entrySet()){
            System.out.println(entry.getKey());
            System.out.println(entry.getValue());
        }
        System.out.println("集合的大小："+map.size()
        );
        //删除集合中的键为age的元素
        for (Map.Entry<String ,String>entry:map.entrySet()){
            if (entry.getKey().equals("age"));
            map.remove(entry.getKey());
        }
        System.out.println("集合的大小： "+map.size());
    }

}
